Description:
This plugin allows users to click an ageable mob, any mob that has a baby form, with a milk bucket to turn that mob into a baby. Mobs will age back into adults after the normal Minecraft age time. This is intentional, as it prevents users from converting entire cow farms perinatally into babies. Players in creative mode will not have their milk bucket consumed, while players in survival and adventure mode will.

Usecase:
Mobs are just cuter when they are babies, this plugin lets your players keep their pets cute forever. This is the perfect plugin for a mostly vanilla survival server. It lets your players have some fun, play some pranks, and have cool pets, all while maintaining the integrity of the game.
This idea came from an easter egg in essentialsX allowing users to right-click on mobs with a milk bucket to turn them into babies.

Example of plugin in action: